Related name for reverse access in Django - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the related_name attribute in Django models?

The related_name attribute defines the name to use for the reverse relation from the related object back to this one. It lets you access related objects easily from the other side of the relationship.

beginner

How do you access all Book objects related to an Author if related_name='books' is set on the ForeignKey?

You can access all books of an author by using author.books.all(). The related_name 'books' creates this attribute on the Author instance.

beginner

What happens if you do NOT set related_name on a ForeignKey in Django?

Django creates a default reverse name by using the lowercase model name with '_set' appended. For example, if the model is Book, the reverse name will be book_set.

intermediate

Can two ForeignKey fields in different models use the same related_name?

No, related_name must be unique per model to avoid clashes in reverse relations. If two fields use the same name, Django will raise an error.

intermediate

How does related_name='+' affect reverse access in Django?

Setting related_name='+' disables the reverse relation. This means you cannot access the related objects from the other side.

What does related_name control in Django models?

A The primary key field name

B The database table name

C The name of the reverse relation from the related model

D The model's verbose name

related_name sets the attribute name for reverse access from the related model back to this model.

If you have author = ForeignKey(Author, related_name='books'), how do you get all books of an author?

A author.books.all()

B author.book_set.all()

C author.get_books()

D author.books_set.all()

The related_name='books' creates the attribute books on the Author instance.

What is the default reverse name if related_name is not set?

A related_set

B modelname_set

C reverse_name

D default_related

Django uses the lowercase model name plus '_set' as the default reverse name.

What does setting related_name='+' do?

A Disables reverse relation

B Sets reverse relation to default

C Creates a reverse relation with name '+'

D Raises an error

Using '+' disables the reverse relation, so no attribute is created on the related model.

Can two ForeignKey fields in different models share the same related_name?

A Yes, always

B Only if fields have different names

C Only if models are unrelated

D No, it causes a conflict

related_name must be unique per model to avoid reverse relation conflicts.

Explain what related_name does in Django and why it is useful.

Think about how you get from one model to related objects in the other direction.

Describe what happens if you set related_name='+' on a ForeignKey field.

Consider when you might not want the reverse link.